- Happy Lass
- 1935 Spero
This classic single screw motor yacht was built by James A. Silver Ltd, at Rosneath, for the prominent Clyde engineer, Mr. C Shanks. She was the sixth example of the new Brown Owl Class and was designed in close collaboration with the commissioning owner. She boasted a single engine installation, rare for this type of craft, with innovative vibration, absorption and possibly the first marine use of a calorifier.
Requisitioned by Admiralty as auxiliary patrol vessel
Defensive equipment of Merchant Ships (DEMS) service
Compulsorily purchased by MOWT (still DEMS service)
returned by sale to previous owner
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